CSS Editor

In UI Rig you can customize the style of your apps with CSS.

Paint Calculator with Custom Styles


With the Key Editor, tag the Groups and Elements you want to style. That key-name becomes a CSS class that you can target in a stylesheet.

Editing CSS styles in UI Rig.
fieldset.css_demo {
  border: 8px solid lightgrey;
  border-radius: 24px;
.css_demo h1     { text-align: center; }

.entry_b label   { text-align: right; }
.entry_b input   { font-weight: bold; }

.button_b        { display: block; }
.button_b button { width: 100%; }

Editing the Stylesheet

DesignerCSS Editor

Option 1. Use the text editor of your choice, and run our open source CSS Editor Connector. That program connects your editor to UI Rig, and live-reloads less, scss, and css stylesheets.

Option 2. Use the integrated editor, which only works with CSS.

Technical Details

Your style rules get applied last. Therefore, they override (in cascade) the default ones.

By the way, don’t use the default classes (the ones starting with an underscore, they’re auto-generated and will change without notice.

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